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Electrodynamics of single-crystal Eu2CuO4 - A boson excitation spectrum

  • Author(s): Reagor, DW;
  • Cheong, S;
  • Brown, SE;
  • Migliori, A;
  • Fisk, Z;
  • Thompson, JD
  • et al.

Static and microwave measurements of the electronic response of the planar cuprate Eu2CuO4 provide evidence for thermally activated collective excitations. These observations together with microwave and other measurements on superconductors suggest that paired charge-carrying objects may exist both above and below Tc in the superconductors. If these objects, which can be related to solitons of a spin density wave ground state, play a role in superconductivity, certain conclusions may be drawn. We discuss here the evidence for such objects and their implications. © 1989.

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